ESP8266定时器篇源代码

/** * @file * Sockets BSD-Like API module * */ /* * Copyright (c) 2001-2004 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * This file is part of the lwIP TCP/IP stack. * * Author: Adam Dunkels <adam@sics.se> * * Improved by Marc Boucher <marc@mbsi.ca> and David Haas <dhaas@alum.rpi.edu> * */ #include "lwip/opt.h" #if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */ #include "lwip/sockets.h" #include "lwip/api.h" #include "lwip/sys.h" #include "lwip/igmp.h" #include "lwip/inet.h" #include "lwip/tcp.h" #include "lwip/raw.h" #include "lwip/udp.h" #include "lwip/tcpip.h" #include "lwip/pbuf.h" #if LWIP_CHECKSUM_ON_COPY #include "lwip/inet_chksum.h" #endif #include <string.h> #define NUM_SOCKETS MEMP_NUM_NETCONN /** Contains all internal pointers and states used for a socket */ struct lwip_sock { /** sockets currently are built on netconns, each socket has one netconn */ struct netconn *conn; /** data that was left from the previous read */ void *lastdata; /** offset in the data that was left from the previous read */ u16_t lastoffset; /** number of times data was received, set by event_callback(), tested by the receive and select functions */ s16_t rcvevent; /** number of times data was ACKed (free send buffer), set by event_callback(), tested by select */ u16_t sendevent; /** error happened for this socket, set by event_callback(), tested by select */ u16_t errevent; /** last error that occurred on this socket */ int err; /** counter of how many threads are waiting for this socket using select */ int select_waiting; }; /** Description for a task waiting in select */ struct lwip_select_cb { /** Pointer to the next waiting task */ struct lwip_select_cb *next; /** Pointer to the previous waiting task */ struct lwip_select_cb *prev; /** readset passed to select */ fd_set *readset; /** writeset passed to select */ fd_set *writeset; /** unimplemented: exceptset passed to select */ fd_set *exceptset; /** don't signal the same semaphore twice: set to 1 when signalled */ int sem_signalled; /** semaphore to wake up a task waiting for select */ sys_sem_t sem; }; /** This struct is used to pass data to the set/getsockopt_internal * functions running in tcpip_thread context (only a void* is allowed) */ struct lwip_setgetsockopt_data { /** socket struct for which to change options */ struct lwip_sock *sock; #ifdef LWIP_DEBUG /** socket index for which to change options */ int s; #endif /* LWIP_DEBUG */ /** level of the option to process */ int level; /** name of the option to process */ int optname; /** set: value to set the option to * get: value of the option is stored here */ void *optval; /** size of *optval */ socklen_t *optlen; /** if an error occures, it is temporarily stored here */ err_t err; }; /** The global array of available sockets */ static struct lwip_sock sockets[NUM_SOCKETS]; /** The global list of tasks waiting for select */ static struct lwip_select_cb *select_cb_list; /** This counter is increased from lwip_select when the list is chagned and checked in event_callback to see if it has changed. */ static volatile int select_cb_ctr; /** Table to quickly map an lwIP error (err_t) to a socket error * by using -err as an index */ static const int err_to_errno_table[] = { 0, /* ERR_OK 0 No error, everything OK. */ ENOMEM, /* ERR_MEM -1 Out of memory error. */ ENOBUFS, /* ERR_BUF -2 Buffer error. */ EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */ EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */ EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */ EINVAL, /* ERR_VAL -6 Illegal value. */ EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block. */ ECONNABORTED, /* ERR_ABRT -8 Connection aborted. */ ECONNRESET, /* ERR_RST -9 Connection reset. */ ESHUTDOWN, /* ERR_CLSD -10 Connection closed. */ ENOTCONN, /* ERR_CONN -11 Not connected. */ EIO, /* ERR_ARG -12 Illegal argument. */ EADDRINUSE, /* ERR_USE -13 Address in use. */ -1, /* ERR_IF -14 Low-level netif error */ -1, /* ERR_ISCONN -15 Already connected. */ }; #define ERR_TO_ERRNO_TABLE_SIZE \ (sizeof(err_to_errno_table)/sizeof(err_to_errno_table[0])) #define err_to_errno(err) \ ((unsigned)(-(err)) < ERR_TO_ERRNO_TABLE_SIZE ? \ err_to_errno_table[-(err)] : EIO) #ifdef ERRNO #ifndef set_errno #define set_errno(err) errno = (err) #endif #else /* ERRNO */ #define set_errno(err) #endif /* ERRNO */ #define sock_set_errno(sk, e) do { \ sk->err = (e); \ set_errno(sk->err); \ } while (0) /* Forward delcaration of some functions */ static void event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len); static void lwip_getsockopt_internal(void *arg); static void lwip_setsockopt_internal(void *arg); /** * Initialize this module. This function has to be called before any other * functions in this module! */ void lwip_socket_init(void) { } /** * Map a externally used socket index to the internal socket representation. * * @param s externally used socket index * @return struct lwip_sock for the socket or NULL if not found */ static struct lwip_sock * get_socket(int s) { struct lwip_sock *sock; if ((s < 0) || (s >= NUM_SOCKETS)) { LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): invalid\n", s)); set_errno(EBADF); return NULL; } sock = &sockets[s]; if (!sock->conn) { LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): not active\n", s)); set_errno(EBADF); return NULL; } return sock; } /** * Same as get_socket but doesn't set errno * * @param s externally used socket index * @return struct lwip_sock for the socket or NULL if not found */ static struct lwip_sock * tryget_socket(int s) { if ((s < 0) || (s >= NUM_SOCKETS)) { return NULL; } if (!sockets[s].conn) { return NULL; } return &sockets[s]; } /** * Allocate a new socket for a given netconn. * * @param newconn the netconn for which to allocate a socket * @param accepted 1 if socket has been created by accept(), * 0 if socket has been created by socket() * @return the index of the new socket; -1 on error */ static int alloc_